metro - Al Esparza, President of LULAC in San Antonio, left, holds a Dream Act sign high, as Paul Chavez, the son of Cesar E. Chavez, center, stands by as Mayor Julian Castro, right, holding his daughter, Carina Castro, 3, stands by during a presentation outside City Hall during the Cesar E. Chavez March for Justice in San Antonio on Saturday, March 31, 2012. LISA KRANTZ/San Antonio Express-News (SAN ANTONIO EXPRESS-NEWS) less

metro - Al Esparza, President of LULAC in San Antonio, left, holds a Dream Act sign high, as Paul Chavez, the son of Cesar E. Chavez, center, stands by as Mayor Julian Castro, right, holding his daughter, ... more

Congressional candidate Joaquin Castro (from left) his girlfriend Anna Flores, Erica Castro, Mayor Julian Castro and their daughter Carina, 3, wait to take the stage during a welcome home and birthday party celebration held Monday Sept. 10, 2012 at Sunset Station. The twins will be 38-years-old on Sept. 16. (San Antonio Express-News) less

Congressional candidate Joaquin Castro (from left) his girlfriend Anna Flores, Erica Castro, Mayor Julian Castro and their daughter Carina, 3, wait to take the stage during a welcome home and birthday party ... more

Mayor Julian Castro (center) hugs his daughter Carina, 3, as his wife Erica Castro (left) and his mom Rosie Castro look on before taking the stage with his twin brother congressional candidate Joaquin Castro (not pictured) at a welcome home and birthday party celebration held Monday Sept. 10, 2012 at Sunset Station. The twins will be 38-years-old on Sept. 16. (San Antonio Express-News) less

Mayor Julian Castro (center) hugs his daughter Carina, 3, as his wife Erica Castro (left) and his mom Rosie Castro look on before taking the stage with his twin brother congressional candidate Joaquin Castro ... more

Congressional candidate Joaquin Castro (from left) his girlfriend Anna Flores, Erica Castro, Mayor Julian Castro their daughter Carina, 3, and the twins mom Rosie Castor wait to take the stage during a welcome home and birthday party celebration held Monday Sept. 10, 2012 at Sunset Station. The twins will be 38-years-old on Sept. 16. (San Antonio Express-News) less

Congressional candidate Joaquin Castro (left) and his twin brother Mayor Julian Castro with his daughter Carina, 3, blow out candles on a cake during a welcome home and birthday party celebration held Monday Sept. 10, 2012 at Sunset Station. The twins will be 38-years-old on Sept. 16. (San Antonio Express-News) less

Congressional candidate Joaquin Castro (left) and his twin brother Mayor Julian Castro with his daughter Carina, 3, blow out candles on a cake during a welcome home and birthday party celebration held Monday ... more

Mayor Julian Castro takes a break from rehearsing his keynote speech with his wife, Erica Castro, and their daughter, Carina, 3, in their hotel room a few hours before the start of the Democratic National Convention in Charlotte, NC on Tuesday, Sept. 4, 2012. (San Antonio Express-News) less

Mayor Julian Castro takes a break from rehearsing his keynote speech with his wife, Erica Castro, and their daughter, Carina, 3, in their hotel room a few hours before the start of the Democratic National ... more

Mayor Julian Castro takes a break with his daughter, Carina, 3, in their hotel room as he prepares for his keynote speech during the Democratic National Convention in Charlotte, NC on Tuesday, Sept. 4, 2012. (San Antonio Express-News) less

Mayor Julian Castro takes a break with his daughter, Carina, 3, in their hotel room as he prepares for his keynote speech during the Democratic National Convention in Charlotte, NC on Tuesday, Sept. 4, 2012. ... more

Mayor Julian Castro takes a lunch break with his wife, Erica Castro, and their daughter, Carina, 3, in their hotel room as he prepares for his keynote speech during the Democratic National Convention in Charlotte, NC on Tuesday, Sept. 4, 2012. (San Antonio Express-News) less

Mayor Julian Castro takes a lunch break with his wife, Erica Castro, and their daughter, Carina, 3, in their hotel room as he prepares for his keynote speech during the Democratic National Convention in ... more

Mayor Julian Castro takes a lunch break with his wife, Erica Castro, and their daughter, Carina, 3, in their hotel room as he prepares for his keynote speech during the Democratic National Convention in Charlotte, NC on Tuesday, Sept. 4, 2012. (San Antonio Express-News) less

Mayor Julian Castro takes a lunch break with his wife, Erica Castro, and their daughter, Carina, 3, in their hotel room as he prepares for his keynote speech during the Democratic National Convention in ... more

Mayor Julian Castro takes a break with his wife, Erica Castro, and their daughter, Carina, 3, in their hotel room as he prepares for his keynote speech during the Democratic National Convention in Charlotte, NC on Tuesday, Sept. 4, 2012. (San Antonio Express-News) less

Mayor Julian Castro takes a break with his wife, Erica Castro, and their daughter, Carina, 3, in their hotel room as he prepares for his keynote speech during the Democratic National Convention in Charlotte, NC ... more

Mayor Julian Castro, right, holding his daughter, Carina, 3, and his brother, Joaquin Castro, left, greet supporters upon their arrival at the send-off party for their trip to the Democratic National Convention at the St. Paul Community Center in San Antonio on Saturday, Sept. 1, 2012. (San Antonio Express-News) less

Mayor Julian Castro, right, holding his daughter, Carina, 3, and his brother, Joaquin Castro, left, greet supporters upon their arrival at the send-off party for their trip to the Democratic National Convention ... more

Mayor Julian Castro, right, holding his daughter, Carina, 3, and his brother, Joaquin Castro, left, greet supporters upon their arrival at the send-off party for their trip to the Democratic National Convention at the St. Paul Community Center in San Antonio on Saturday, Sept. 1, 2012. (San Antonio Express-News) less

Mayor Julian Castro, right, holding his daughter, Carina, 3, and his brother, Joaquin Castro, left, greet supporters upon their arrival at the send-off party for their trip to the Democratic National ... more

Mayor Julian Castro, right, holds his daughter, Carina, 3, as he greets supporters upon his arrival at the send-off party for his trip to the Democratic National Convention at the St. Paul Community Center in San Antonio on Saturday, Sept. 1, 2012. (San Antonio Express-News) less

Mayor Julian Castro, right, holds his daughter, Carina, 3, as he greets supporters upon his arrival at the send-off party for his trip to the Democratic National Convention at the St. Paul Community Center in ... more

Mayor Julian Castro, holding his daughter, Carina, 3, is surrounded by supporters at the send-off party for his trip to the Democratic National Convention at the St. Paul Community Center in San Antonio on Saturday, Sept. 1, 2012. (San Antonio Express-News) less

Mayor Julian Castro, holding his daughter, Carina, 3, is surrounded by supporters at the send-off party for his trip to the Democratic National Convention at the St. Paul Community Center in San Antonio on ... more

Mayor Julian Castro, center, stands with his wife, Erica Castro, their daughter, Carina, 3, and his brother, Joaquin Castro, right, on stage during the send-off party for their trip to the Democratic National Convention at the St. Paul Community Center in San Antonio on Saturday, Sept. 1, 2012. (San Antonio Express-News) less

Mayor Julian Castro, center, stands with his wife, Erica Castro, their daughter, Carina, 3, and his brother, Joaquin Castro, right, on stage during the send-off party for their trip to the Democratic National ... more

Choco Meza, left, introduces the Castro family including Mayor Julian Castro, center, his wife, Erica Castro, their daughter, Carina, 3, and his brother, Joaquin Castro, right, during the send-off party for their trip to the Democratic National Convention at the St. Paul Community Center in San Antonio on Saturday, Sept. 1, 2012. (San Antonio Express-News) less

Choco Meza, left, introduces the Castro family including Mayor Julian Castro, center, his wife, Erica Castro, their daughter, Carina, 3, and his brother, Joaquin Castro, right, during the send-off party for ... more

Mayor Julian Castro kisses his wife, Erica, with their daughter, Carina, 3, as his brother, Joaquin Castro, right, embraces Father Jimmy Drennan during the send-off party for their trip to the Democratic National Convention at the St. Paul Community Center in San Antonio on Saturday, Sept. 1, 2012. (San Antonio Express-News) less

Mayor Julian Castro kisses his wife, Erica, with their daughter, Carina, 3, as his brother, Joaquin Castro, right, embraces Father Jimmy Drennan during the send-off party for their trip to the Democratic ... more

Rosie Castro, the mother of Mayor Julian Castro, his wife, Erica Castro and their daughter, Carina, 3, are shown in their seats on the video screen behind him as he gives the keynote address on the first night of the Democratic National Convention at Time Warner Cable Arena in Charlotte, NC on Tuesday, Sept. 4, 2012. (San Antonio Express-News) less

Rosie Castro, the mother of Mayor Julian Castro, his wife, Erica Castro and their daughter, Carina, 3, are shown in their seats on the video screen behind him as he gives the keynote address on the first night ... more

Mayor Julian Castro kisses his wife, Erica, with their daughter, Carina, 3, as his brother, Joaquin Castro, right, embraces Father Jimmy Drennan during the send-off party for their trip to the Democratic National Convention at the St. Paul Community Center in San Antonio on Sept. 1, 2012. Castro delivers the convention's keynote address Tuesday, a nod to the importance of Hispanic voters in the race. (AP Photo/San Antonio Express-News, Lisa Krantz) (Associated Press) less

Mayor Julian Castro kisses his wife, Erica, with their daughter, Carina, 3, as his brother, Joaquin Castro, right, embraces Father Jimmy Drennan during the send-off party for their trip to the Democratic ... more